Method of retransmission to reduce the overhead

Abstract

A method of transmitting data in a wireless access system and a packet retransmitting method therein are disclosed. The present invention includes receiving an initial control message including information required for a packet retransmission from a base station, transmitting the packet to be provided with a service from the base station, and if a NACK (non-acknowledgement) signal is received from the base station, retransmitting the packet corresponding to the NACK signal to the base station using the information required for the packet retransmission and included in the initial control message. Therefore, since a separate control message needs not to be transmitted in case of packet retransmission,.it is able to save radio resources and reduce an overhead by retransmitting a packet via a previously allocated retransmission region without the separate control message.

Description

TECHNICAL FIELD[0001]The present invention relates to a method of transmitting data in a wireless access system, and more particularly, to various packet retransmission methods in the data transmitting method.BACKGROUND ART[0002]In the following description, explained is a method of transmitting packets in terminals that use IP based voice over internet protocol (hereinafter abbreviated ‘VoIP’) in a broadband wireless access system. For this, VoIP traffic is described as follows. Yet, a packet transmitting method according to the present invention needs not to be limited to the VoIP packet transmission described in the following.[0003]First of all, VoIP traffic is characterized in being generated in a fixed size with a fixed period in VoIP codec. And, VoIP communication can be divided into a talk period (talk-spurt), for which inter-user call is in progress, and a silence period for which a user is not talking but listening. In general, the silence period occupies over 50% in a whol...

AI Technical Summary

Benefits of technology

[0039]Accordingly, the present invention provides the following effects or advantages.

[0040]First of all, data communication can be efficiently performed using the embodiments of the present invention.

[0041]Secondly, in case that frequent packet retransmissions are necessary, a fixed retransmission region can be allocated to a mobile station via an initial control message instead of allocating a retransmission region each time. In particular, if it becomes necessary to perform a retransmission, it is able to retransmit a packet via a previously allocated retransmission region without a separate control message. Therefore, since an additional and separated control message needs not to be transmitted in case of packet retransmission, it is able to save radio resources and reduce an overhead.

[0042]Thirdly, in case that frequent packet transmissions / receptions are necessary like VoIP service, the present invention is able to reduce an overhead generated from retransmitting an erroneous packet.

[0043]Fourthly, by allocating a retransmission region to each of at least one or more mobile stations, packets can be quickly retransmitted via the allocated resource region in case that the mobile stations perform retransmissions. Therefore, efficient data processing is enabled.

[0044]And, at least one or more mobile stations having the same attributes are grouped together and a retransmission region is then allocated per group. Therefore, it is able to save radio resources.

Problems solved by technology

Since voice data is not generated for the silence period, if a bandwidth is allocated to the silence period, it may bring about a resource waste.

Since the SR ARQ scheme gives a sequence to each frame and manages it, the implementation of the SR ARQ scheme may becomes complicated relatively.

Although this scheme enables decoding more accurate than the second type HARQ scheme, it has efficiency poorer than that of the second type HARQ scheme in aspect of coding gain.

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